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<Radius d:type="sFloat32">100</Radius>
<Phi d:type="sFloat32">25</Phi>
<Theta d:type="sFloat32">4</Theta>
<Colour>
<cHcColour>
<Red d:type="sFloat32">0.5</Red>
<Green d:type="sFloat32">0.5</Green>
<Blue d:type="sFloat32">0.3</Blue>
<Alpha d:type="sFloat32">1</Alpha>
</cHcColour>
Just reduce the values of red,green and blue and you'll get realistic lights. Alpha is not relevant.
Sometimes I use even smaller values.
On older locos you don't see any light on the ground in the daytime.
With such reduced light you may extend the distance, but you have to check the performance in the game (shift+z).
A smooth theta let things becomming slowly brighter when approaching.
Then there is this thing called Flaresize. I think it is too emphasized in the game. Just reduce it to a maximum value of 1.